Use of tests to measure skill, knowledge, intelligence, capacities, or aptitudes and to make predictions about performance. Best known is the IQ test; other tests include achievement testsdesigned to evaluate a student's grade or performance leveland personality tests. The latter include both inventory-type (question-and-response) tests and projective tests such as the Rorschach (inkblot) and thematic apperception (picture-theme) tests, which are used by clinical psychologists and psychiatrists to help diagnose mental disorders and by psychotherapists and counselors to help assess their clients. Experimental psychologists routinely devise tests to obtain data on perception, learning, and motivation. Clinical neuropsychologists often use tests to assess cognitive functioning of people with brain injuries. See also experimental psychology; psychometrics.
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